1) Non-attribution does not mean a different source per se. Some documents can be verified without any discussion of their source. (ie the NSA acknowledges their authenticity by demanding their takedown as "classified"). Powers are building cases against Snowden. Those releasing documents don't want to help that process.
2) Attribution to Snowden does is no guarantee that he is the source. Snowden is not the author, just the delivery means. And he doesn't know personally exactly which documents he handed over. There were just too many for that to be true. So to protect another source they may falsely attribute something to Snowden, with or without his permission. Not good journalism, but very possible.
There are so many documents in these agencies that leaks are inevitable. With tens of thousands, perhaps a hundred thousand people in positions to read them, documents have appeared constantly. Snowden was simply a massive uptick in an ongoing stream, not the first and no doubt not the last.
My disappointment is that with all of these leaks I have to give up the childhood hope that aliens have visited us. Such secrets could never be kept by these agencies.
Lets look at a radical but more likely proposition: NTBMs . If an international private security organization had these things they could construct LARGE underground installations. They could conduct psychological experiments akin to mk-ultra  on isolated populations. The under-people would experience this reality as simply: how things were. They would have always been underground. It would be all they knew. The explanatory pseudo-religion necessary to alleviate their condition wouldn't be that complicated. An agency could use these under-people to perfect it's propaganda methods. The power vectors granted by controlling large hidden facilities are pretty interesting; A significantly advanced and private awareness of causation would allow the manufacture of nearly certain events shrouded by ostensible ignorance. This would be much more effective, over time, if it were coupled with a massive and private surveillance network to close the feedback loop.
coild you describe your point more clearly?
TL;DR: Just because I'm paranoid doesn't mean someone isn't out to get me.
Again, though, this is an exceptional one that seems more reliable. Probably because existence of extra leakers is important to both sides for different reasons.
Called out the blog as NSA fanboy to max then content seemed to change with stuff like this. Given comments, I felt it was to look more objective when seeding disinformation rather than person doing a 180.
In recent years, the IC has made major strides toward enhancing transparency. These include establishing the Office of Director of National Intelligence (ODNI) IC on the Record, a repository for declassified documents, official statements, speeches and testimony on the Tumblr blogging platform. To date, more than 5,000 pages of officially released documents have been published on IC on the Record.